English

Extending Andrews and Newman's refinement of the crank-mex theorem

Combinatorics 2025-11-26 v1 Number Theory

Abstract

The crank-mex theorem states that the number of integer partitions of nn with nonnegative crank equals the number with odd minimal excludant (mex). Andrews and M. Newman recently refined that result in terms of the number of parts greater than one. Here, we establish and expand a complementary result connecting the partitions with even mex, having fixed points, with negative crank, and with positive crank, all refined in terms of number of parts greater than one. We provide both analytic and combinatorial proofs.

Keywords

Cite

@article{arxiv.2511.19698,
  title  = {Extending Andrews and Newman's refinement of the crank-mex theorem},
  author = {George E. Andrews and Brian Hopkins},
  journal= {arXiv preprint arXiv:2511.19698},
  year   = {2025}
}

Comments

12 pages, 4 tables